Perry (Linus Roache), an English widower, decides he needs a break away from everything to help him get over his bereavement after the sudden death of his wife. So he heads for the Australian outback, where he joins up with a party of Aussies on a tour bus with a crazy driver.

This is not a luxury tour but one at the other end of the scale and SIAM SUNSET tracks the adventures that befall Perry and the coach party including natural disasters and human disasters - a violent lover chasing his girl, Grace (Danielle Cormack) who has just met Perry.